I’m fabricating a cold air base to use at the track.

First - I have seen the Engine Masters video but it doesn’t address the issue of contoured ‘air bell’ profile. A crucial omission by those guys imho.

Moving on - The 65 A990 cars ran a dual contoured air bell cold air system, HOWEVER, the 67 ‘023’ Super stockers ran a base with a much more aggressive throat ‘entry’ (see pic)

This raises the question how important an ‘air bell’ type entry is?

Any thoughts or experiences?